Hoping to find the Lost Dutchman's Mine, brothers Henry, Simon and Jack rejoin their friend Delilah in researching local history and visiting a ghost town. Missing on Superstition Mountain is the first book.

After a spaceship lands in Vern Hollow in 1956, juvenile delinquent Jack and studious Isadora form an unexpected alliance as they try to keep a group of extraterrestrials from stealing eccentric Uncle Bud's space travel machine.